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#anoxia

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Marine #anoxia is characterized by the oceans being severely depleted in dissolved #oxygen, making them toxic and thus having devastating impacts on the organisms inhabiting them.

Global warming caused widespread #ocean anoxia 93 million years ago.

Persistent low-oxygen layers increase in number and size with enhanced warming of the oceans, forming a thick zone at depth below a highly productive thin surface layer that is oxygen-rich.

#climate
phys.org/news/2024-01-global-w

Phys.org · Global warming caused widespread ocean anoxia 93 million years ago, deep-sea sediments research suggestsBy Hannah Bird

#GlobalWarming caused widespread ocean #anoxia 93 million years ago, #DeepSea sediments research suggests
phys.org/news/2024-01-global-w

#Warming drove the expansion of #MarineAnoxia in the equatorial #Atlantic during the #Cenomanian leading up to Oceanic #Anoxic Event 2 cp.copernicus.org/articles/19/

"During such scenarios, organic matter is buried at an elevated rate, producing distinctive layers of black #shale in the #geological record, which are depleted in the isotopically-heavier #carbon-13"

This study is the result of a #GLEON (Global Lake Ecosystem Observation Network) project on #Anoxia led by the talented ECR Abby Lewis. Globally, anoxia in lakes is reinforced by #ClimateChange in a feedback loop that is difficult to break out of.
phys.org/news/2024-01-anoxia-b

Phys.org · Anoxia begets anoxia: A positive feedback to the deoxygenation of temperate lakesBy Philomena Konstantinidis

#Permian marine #MassExtinction linked to #volcanism-induced anoxia phys.org/news/2023-12-permian-

Coupled #volcanic activity and marine #anoxia in the Upper #Yangtze region prior to the #Capitanian mass #extinction sciencedirect.com/science/arti

"The geochemical data and decline in calcareous #algae and fusulinacean #foraminifera... indicates #MarineAnoxia and more pronounced stratification... In such conditions, #OxygenMinimumZones likely developed... that would have inhibited the survival of organisms."

Study challenges assumption that higher #oxygen levels led to rise of multicellular organisms in Earth's oceans phys.org/news/2023-07-assumpti

Widespread #seafloor #anoxia during generation of the #Ediacaran Shuram carbon isotope excursion onlinelibrary.wiley.com/doi/10

"there was no major increase in the amount of oxygen when more advanced #fauna began to evolve and dominate Earth. In fact, there was somewhat of a slight decrease"

Geologists find evidence of dual #MassExtinctions 260 million years ago phys.org/news/2023-04-geology-

Global oceanic #anoxia linked with the Capitanian (Middle #Permian) marine #MassExtinction sciencedirect.com/science/arti

Oxygen-deprived oceans precipitated two mass extinctions around 259 million and 262 million years ago during the Middle Permian Period.